/ Dictionary / Index R respiratory chain: Meaning and Definition of Find definitions for: res'piratory chain" Pronunciation: [key] — Biochem. Biochem. a series of mitochondrial proteins that transport electrons of hydrogen, released in the Krebs cycle, from acetyl coenzyme A to inhaled oxygen to form HO: the energy released in the process is conserved as ATP. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. respiratory respiratory distress syndrome Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language